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A freshly prepared radioactive substance of half-life 2 hours emits radiations of intensity 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this substance is

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A freshly prepared radioactive substance of half-life 2 hours emits radiations of intensity 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this substance is






 
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